Sirichol's place is perfect if you're looking for a cozy space in the Ruam Rudee area. Her place has all the necessary essentials. There's even a pool and a gym, if you want to work out. It is about a 5 minute walk to the main road and around a 12 min walk to the BTS station, but there's also a shuttle available that can take you to the BTS, up to 6pm.
Sirichol is also a very responsive host. She replies quite quickly and was helpful when I had questions. I'd recommend staying at her place.